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/**
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* Back 2 Browser Bytecode Translator
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* Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. Look for COPYING file in the top folder.
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* If not, see http://opensource.org/licenses/GPL-2.0.
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*/
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package org.apidesign.bck2brwsr.mojo;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.FileWriter;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.net.MalformedURLException;
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import java.net.URL;
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import java.net.URLClassLoader;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Enumeration;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Set;
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import java.util.jar.JarEntry;
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import java.util.jar.JarFile;
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import org.apache.maven.artifact.Artifact;
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import org.apache.maven.plugin.AbstractMojo;
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import org.apache.maven.plugin.MojoExecutionException;
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import org.apache.maven.plugin.MojoFailureException;
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import org.apache.maven.plugins.annotations.LifecyclePhase;
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import org.apache.maven.plugins.annotations.Mojo;
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import org.apache.maven.plugins.annotations.Parameter;
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import org.apache.maven.plugins.annotations.ResolutionScope;
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import org.apache.maven.project.MavenProject;
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import org.apidesign.vm4brwsr.Bck2Brwsr;
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import org.apidesign.vm4brwsr.ObfuscationLevel;
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/**
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*
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* @author Jaroslav Tulach
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* @since 0.9
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*/
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@Mojo(name = "aot",
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requiresDependencyResolution = ResolutionScope.COMPILE_PLUS_RUNTIME,
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defaultPhase = LifecyclePhase.PACKAGE
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)
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public class AheadOfTime extends AbstractMojo {
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@Parameter(defaultValue = "${project}")
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private MavenProject prj;
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/**
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* Directory where to generate ahead-of-time JavaScript files for
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* required libraries.
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*/
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@Parameter(defaultValue = "${project.build.directory}/lib")
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private File aot;
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/** Root JavaScript file to generate */
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@Parameter(defaultValue="${project.build.directory}/bck2brwsr.js")
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private File vm;
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/**
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* The obfuscation level for the generated JavaScript file.
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*
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* @since 0.5
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*/
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@Parameter(defaultValue = "NONE")
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private ObfuscationLevel obfuscation;
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@Override
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public void execute() throws MojoExecutionException, MojoFailureException {
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try {
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URLClassLoader loader = buildClassLoader(null, prj.getArtifacts());
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for (Artifact a : prj.getArtifacts()) {
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if (a.getFile() == null) {
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continue;
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}
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String n = a.getFile().getName();
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if (!n.endsWith(".jar")) {
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continue;
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}
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aot.mkdirs();
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File js = new File(aot, n.substring(0, n.length() - 4) + ".js");
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aotLibrary(a, js , loader);
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}
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FileWriter w = new FileWriter(vm);
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Bck2Brwsr.newCompiler().
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obfuscation(obfuscation).
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standalone(false).
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resources(new Bck2Brwsr.Resources() {
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@Override
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public InputStream get(String resource) throws IOException {
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return null;
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}
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}).
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generate(w);
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w.close();
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} catch (IOException ex) {
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throw new MojoExecutionException("Can't compile", ex);
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}
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}
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private void aotLibrary(Artifact a, File js, URLClassLoader loader) throws IOException {
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List<String> classes = new ArrayList<String>();
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List<String> resources = new ArrayList<String>();
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Set<String> exported = new HashSet<String>();
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JarFile jf = new JarFile(a.getFile());
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listJAR(jf, classes , resources, exported);
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FileWriter w = new FileWriter(js);
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Bck2Brwsr.newCompiler().
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obfuscation(obfuscation).
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library(true).
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resources(loader).
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addResources(resources.toArray(new String[0])).
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addClasses(classes.toArray(new String[0])).
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addExported(exported.toArray(new String[0])).
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generate(w);
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w.close();
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}
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private static URLClassLoader buildClassLoader(File root, Collection<Artifact> deps) throws MalformedURLException {
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List<URL> arr = new ArrayList<URL>();
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if (root != null) {
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arr.add(root.toURI().toURL());
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}
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for (Artifact a : deps) {
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if (a.getFile() != null) {
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arr.add(a.getFile().toURI().toURL());
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}
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}
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return new URLClassLoader(arr.toArray(new URL[0]), Java2JavaScript.class.getClassLoader());
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}
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private static void listJAR(
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JarFile j, List<String> classes,
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List<String> resources, Set<String> exported
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) throws IOException {
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Enumeration<JarEntry> en = j.entries();
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while (en.hasMoreElements()) {
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JarEntry e = en.nextElement();
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final String n = e.getName();
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if (n.endsWith("/")) {
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continue;
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}
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int last = n.lastIndexOf('/');
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String pkg = n.substring(0, last + 1);
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if (n.endsWith(".class")) {
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classes.add(n.substring(0, n.length() - 6));
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} else {
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resources.add(n);
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if (n.startsWith("META-INF/services/") && exported != null) {
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final InputStream is = j.getInputStream(e);
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exportedServices(is, exported);
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is.close();
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}
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}
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}
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String exp = j.getManifest().getMainAttributes().getValue("Export-Package");
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if (exp != null && exported != null) {
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for (String def : exp.split(",")) {
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for (String sep : def.split(";")) {
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exported.add(sep.replace('.', '/') + "/");
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break;
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}
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}
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}
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}
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static void exportedServices(final InputStream is, Set<String> exported) throws IOException {
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BufferedReader r = new BufferedReader(new InputStreamReader(is));
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for (;;) {
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String l = r.readLine();
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if (l == null) {
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break;
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}
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if (l.startsWith("#")) {
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continue;
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}
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exported.add(l.replace('.', '/'));
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}
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}
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}
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